Nine of the party's parliamentarians have signed an amendment seeking to blocking controversial reforms.

Labour party opponents of the UK government’s £5 billion ($6.8 billion) cut to disability benefits have secured enough support to block the plan, setting up a high-stakes test of Prime Minister Keir Starmer’s leadership less than a year into office.

Up to 100 Labour MPs including 11 senior parliamentarians are supporting a so-called reasoned amendment to the welfare bill that seeks to stop the legislation undergoing its first major vote in the House of Commons next week, according to rebels.